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SYSTEMS BIOLOGY, MOLECULAR BIOLOGY, AND GENE REGULATION

A WUSCHEL-LIKE HOMEOBOX Gene Represses a YABBY Gene Expression Required for Rice Leaf Development^1,[C],[W]

National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China (M.D., Y.H., Y.Z., H.L.); and Institut de Biotechnologie des Plantes, Université Paris sud 11, 91405 Orsay, France (D.-X.Z.)

YABBY and WUSCHEL-LIKE HOMEOBOX (WOX) genes have been shown to play important roles in lateral organ formation and meristem function. Here, we report the characterization of functional relationship between rice (Oryza sativa) YAB3 and WOX3 in rice leaf development. Rice YAB3 is closely related to maize (Zea mays) ZmYAB14 and Arabidopsis (Arabidopsis thaliana) FILAMENTOUS FLOWER (FIL), whereas rice WOX3 is highly conserved with maize narrow sheath1 (NS1) and NS2 and Arabidopsis PRESSED FLOWER (PRS). In situ hybridization experiments revealed that the expression of both genes was excluded from the shoot apical meristem, but the transcripts were detected in leaf primordia, young leaves, and reproductive organs without any polar distribution. The function of the two genes was studied by both overexpression and RNA interference (RNAi) in transgenic rice. YAB3 RNAi induced twisted and knotted leaves lacking specialized structures such as ligule and auricles, while no phenotypic change was observed in YAB3 overexpression plants, suggesting that rice YAB3 may be required for leaf cell growth and differentiation. Overexpression of WOX3 repressed YAB3 and showed a YAB3 RNAi phenotype. The expression of class I KNOTTED-LIKE HOMEOBOX (KNOX) genes was ectopically induced in leaves of YAB3 RNAi or WOX3 overexpression plants. Data from inducible WOX3 expression and DNA-protein interaction assays suggested that WOX3 acted as a transcriptional repressor of YAB3. These data reveal a regulatory network involving YAB3, WOX3, and KNOX genes required for rice leaf development.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Dao-Xiu Zhou (dao-xiu.zhou{at}u-psud.fr).

^[C] Some figures in this article are displayed in color online but in black and white in the print edition.

^[W] The online version of this article contains Web-only data.

www.plantphysiol.org/cgi/doi/10.1104/pp.107.095737

^* Corresponding author; e-mail dao-xiu.zhou{at}u-psud.fr; fax 33–1–6915–34–25.

Received January 10, 2007; accepted March 1, 2007; published March 9, 2007.

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